COD4 - great game, lots of fun
Assassin's Creed - pretty cool, kinda repetitive after a while but decent
NCAA football
Warhawk - cool online only game, worth a look. don't have the headset though.
Dirt - it's alright, but no real multiplayer kind of sucks.
Motorstorm - simple arcade-style racing. great looking game, had a good time with it.
FIFA - best game in the series that I've played. I like the game mode where it locks you on one player and you see the down the field view. Wish there was some kind of superstar mode like Madden has.